Whereas Dubai has gone upscale with the world's first (and only) 7-star hotel, Switzerland has gone the opposite way: it has opened (for a trial run) the world's first zero-star hotel, a former nuclear bunker!

"Using the weapon of art, we have created a low-budget hotel, which has charm, takes into account guests' individual wishes and thus becomes quite something," said twin brothers Frank and Patrik Riklin, artists commissioned by local authorities to convert an ancient neighboring factory into a culture center and integrate the bunker.

Organizers said the price per night will be between $9 and $13.

The shared bathroom has been converted into a fountain with swimming flowers, and a live-cam is sending images from the outside onto a large screen in the windowless building.